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Taiwan Semiconductor Corporation 1.5SMC18H
- Part No.:
- 1.5SMC18H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18H.pdf
- Description:
- 1500W, 18V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,345
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Product details
Overview
1.5SMC18H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 16.2–19.8 V breakdown voltage (VBR), 14.5 V working stand-off voltage (VWM), 26.5 V maximum clamping voltage (VC) at 59 A peak pulse current, 1500 W peak pulse power rating, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1.5SMC18H datasheet, 1.5SMC18H pinout, 1.5SMC18H application, or 1.5SMC18H equivalent, this device serves as a robust, fast-response (sub-1 ps) ESD and surge protector in automotive infotainment power supplies, industrial sensor interfaces, and telecom line cards where precise clamping and low leakage (<1 µA @ 14.5 V) are critical.
Technical Context
The 1.5SMC18H operates as a unidirectional avalanche diode with glass-passivated junction, enabling stable breakdown behavior and low leakage under normal operating conditions. Its DO-214AB (SMC) package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
It complies with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive transient immunity and delivers consistent clamping performance across -55°C to +150°C junction temperature range, with thermal resistance of RθJA = 50°C/W and RθJC = 15°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 16.2 V / 19.8 V - defines guaranteed avalanche conduction onset range under 1.0 mA test current |
| VWM | 14.5 V - maximum continuous reverse voltage before significant leakage begins |
| VC @ IPPM | 26.5 V @ 59 A - clamped voltage during 10/1000 µs surge, limiting downstream component stress |
| PPK | 1500 W - peak pulse power handling capability per single 10/1000 µs waveform |
| IR @ VWM | <1 µA - ultra-low reverse leakage ensures minimal standby power loss in battery-powered systems |
| TJ max | +150°C - enables operation in under-hood automotive environments and high-power industrial enclosures |
| Response time | <1.0 ps - near-instantaneous turn-on prevents transient energy from reaching protected ICs |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Weight: 0.210 g. Matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected circuit node; conducts surge current toward cathode during overvoltage |
| Cathode | Ground/Return side | Connected to system ground or low-impedance return path; polarity-marked band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS power domains |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low parameter drift over temperature and life |
| ISO 7637-2 compliance | Guarantees immunity to load-dump and inductive-switching transients common in 12 V/24 V vehicle systems |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling per J-STD-020 |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial and consumer end equipment |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V supply inputs of infotainment head units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to shunt surge energy before it reaches DC-DC converters and microcontrollers. Use Value: Clamps to 26.5 V at 59 A, preventing damage to downstream 3.3 V/5 V logic while maintaining <1 µA leakage during nominal operation. | Use Scenario: Safeguarding analog input pins of PLC analog I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on 4–20 mA loop or thermocouple signal lines, placed before precision amplifier stages. Use Value: Sub-1 ps response ensures no overshoot passes through; 14.5 V VWM allows compatibility with 12 V–15 V sensor excitation rails. |
| Telecom Line Card Protection | Consumer USB Power Delivery |
Use Scenario: Shielding Ethernet PHY power and bias rails in enterprise switches from lightning-induced surges on PoE lines. IC Role / Device Role / Timing Role: Secondary-level TVS on 3.3 V/5 V auxiliary rails, coordinated with upstream gas discharge tubes or polymer PTCs. Use Value: 1500 W peak power rating handles multi-kV induced transients; DO-214AB footprint enables high-density layout on compact line card PCBs. | Use Scenario: Overvoltage protection on VBUS lines of USB-C PD adapters and docking stations. IC Role / Device Role / Timing Role: Fast-acting clamp between VBUS and GND to absorb plug/unplug transients and ESD events up to ±15 kV contact discharge. Use Value: 26.5 V clamping voltage aligns with USB PD 3.0 20 V max output; low capacitance preserves signal integrity on high-speed CC lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Same 18 V nominal breakdown, but SMB package (DO-214AA); lower PPK = 600 W | Lower power handling limits use to sub-30 A surge environments; less suitable for ISO 7637-2 Pulse 5a (load dump) | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4 only |
| 1.5KE18A | Through-hole TO-204AE (DO-41); same 18 V rating and 1500 W rating, but slower response (~1 ns) | Not suitable for automated SMT assembly; requires wave solder or hand-solder; incompatible with high-density layouts | Select only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency |
Compared with SMBJ18A and 1.5KE18A, the 1.5SMC18H uniquely combines SMT manufacturability, AEC-Q101 qualification, ISO 7637-2 compliance, and sub-1 ps response-making it the preferred choice for new automotive and industrial designs requiring high-reliability surface-mount surge suppression.
Availability
1.5SMC18H is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC analog I/O modules, and telecom line card power protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for 1.5SMC18H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 validation capabilities.
The 1.5SMCxxH series was developed specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, emphasizing robust clamping, low leakage, and automated assembly compatibility.
FAQ
What is the breakdown voltage range of the 1.5SMC18H?
The 1.5SMC18H has a guaranteed breakdown voltage (VBR) range of 16.2 V to 19.8 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable avalanche initiation across process variation and temperature, and is verified per the manufacturer's B2207 datasheet revision.
Is the 1.5SMC18H unidirectional or bidirectional?
1.5SMC18H is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It protects against positive transients on the anode-to-cathode path only. For bidirectional protection, TSC offers the 1.5SMC18CH variant, which provides symmetrical clamping in both polarities.
What does the "H" suffix signify in 1.5SMC18H?
The "H" suffix in 1.5SMC18H denotes high-reliability construction per TSC's internal qualification standards-including glass passivation, AEC-Q101 testing, and moisture sensitivity level 1 (MSL-1). It distinguishes this grade from legacy non-H variants that lack automotive qualification and tighter parametric controls.
Can the 1.5SMC18H be used in place of the 1.5SMC18AH?
No-the 1.5SMC18AH has tighter VBR tolerance (17.1–18.9 V vs. 16.2–19.8 V) and higher VWM (15.3 V vs. 14.5 V), making it better suited for applications requiring stricter stand-off margin. The 1.5SMC18H remains appropriate where cost-sensitive designs tolerate wider parametric spread and lower VWM.
What is the maximum clamping voltage of the 1.5SMC18H under surge conditions?
The 1.5SMC18H exhibits a maximum clamping voltage (VC) of 26.5 V at 59 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Fig.5 in the datasheet and defines the upper voltage limit imposed on protected circuits during worst-case transient events.
1.5SMC18H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 59A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18H FAQ
1.How can I place an order for 1.5SMC18H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1.5SMC18H reliable?
The price and inventory of 1.5SMC18H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18H is usually 5 days.
3.What payment methods are accepted for 1.5SMC18H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18H?
1.5SMC18H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1.5SMC18H?
For technical support, including 1.5SMC18H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18H requirements.
6.How does Aetrix verify that 1.5SMC18H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1.5SMC18H meets industry standards.
7.What is the process for return or replacement of 1.5SMC18H?
All 1.5SMC18H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1.5SMC18H part is unused and in its original packaging.
Return procedure for 1.5SMC18H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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